I think we proved in 2014 that the 4-2-5, if executed correctly with the right personnel, is versatile enough for stopping both the spread attack (Oregon) and the power offenses (Bama, Wisky). I'm not sure what defense Sparty used in 2015 against us but it was probably a version of the 4-2-5 and it's well known we borrowed a lot of Narduzzi's D schemes.
What I want to see more than anything this season is if we've learned how to combat Sparty's D like we did in 2014. They adjusted and beat us in 2015. We want to beat them again we'd better adjust to their 4-2-5.